GERRHA, an ancient city of Arabia Felix, on the west side of what is now the Persian Gulf, described by Strabo as inhabited by Chaldaean exiles from Babylon, who built their houses of salt and repaired them by the application of salt water. Three identifications of the site have been attempted, D’Anville choosing El Katig, Niebuhr preferring Koneit, and Forster suggesting the ruins at the head of the bay behind the islands of Bahrein.